scholarly journals Researches of the Impact of the Nominal Power Ratio and Environmental Conditions on the Efficiency of the Photovoltaic System: A Case Study for Poland in Central Europe

2020 ◽  
Vol 12 (15) ◽  
pp. 6162
Author(s):  
Mariusz T. Sarniak
Keyword(s):  
Climatic Conditions ◽  
Photovoltaic System ◽  
Energy Yield ◽  
Power Ratio ◽  
Pv System ◽  
Second Stage ◽  
Pv Inverter ◽  
System A ◽  
The Impact

The paper analyzes a case study of the impact of changing the nominal power ratio (NPR) on the efficiency of a PV (photovoltaic) system located in Poland. In the first stage of the research, the acceptable range of variability for NPR was determined based on simulation calculations, taking into account the parameters of PV modules, inverter, and climatic conditions. The second stage was verification tests for two acceptable extreme cases, carried out based on the analysis of detailed data from the monitoring of PV installations. The results of the verification tests for the two considered periods of operation of the PV system with the change of the NPR coefficient from 82% to 98% resulted in an increase in the annual energy yield by 446.2 kWh. On the other hand, higher relative values of generated energy were obtained only for the months with the lowest insolation in December and in January by 8.2 and 6.04 kWh/kWp, respectively. Higher oversizing of the PV generator (for NPR = 82%) also resulted in an increase by 6.4% in the frequency of operation of the PV inverter in the largest power range (2250–2500 W) and a decrease by 3.7% in the frequency in the lowest power range (0–250 W) for the whole year.

Impact of Storage Integrated Solar Photovoltaics (PV) Power System on Utility Peak Loads

2011 ◽  
Author(s):  
K. Agyenim-Boateng ◽  
R. F. Boehm
Keyword(s):  
Large Scale ◽  
Peak Load ◽  
Average Energy ◽  
Transient Behavior ◽  
Climatic Conditions ◽  
Photovoltaic System ◽  
Solar Pv ◽  
Pv System ◽  
Grid Load ◽  
The Impact

The promise of large-scale use of renewables such as wind and solar for supplying electrical power is tempered by the sources’ transient behavior and the impact this would have on the operation of the grid. One way of addressing this is through the use of supplemental energy storage. While the technology for the latter has not been proven on a large scale or to be economical at the present time, some assessments of what magnitude is required can be made. In performing this work we have used NREL’s Solar Advisor Model (SAM 2010) with TMY3 solar data to estimate the photovoltaic system power generation. Climatic conditions close to load centers were chosen for the simulations. Then the PV output for varying sizes of arrays were examined and the impact of varying amounts of storage investigated. The storage was characterized by maximum limiting energy and power capacities based on annual hourly peak load, as well as its charging and discharging efficiencies. The simulations were performed using hourly time steps with energy withdrawn from, or input to, storage only after considering base generation and the PV system output in serving the grid load. In this work, we examined the load matching capability of solar PV generation (orientated for maximum summer output) for a sample Southwestern US utility grid load of 2008. Specifically we evaluated the daily and seasonal peak load shifting with employing varying storage capacities. The annual average energy penetration based on the usable solar PV output is also examined under these conditions and at different levels of system flexibility.

scholarly journals Hardware Approach to Mitigate the Effects of Module Mismatch in a Grid-connected Photovoltaic System: A Review

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4321 ◽  
Author(s):  
Hussain Bassi ◽  
Zainal Salam ◽  
Mohd Zulkifli Ramli ◽  
Hatem Sindi ◽  
Muhyaddin Rawa
Keyword(s):  
Photovoltaic System ◽  
Energy Yield ◽  
Pv System ◽  
Comparative Performance ◽  
System A ◽  
Dc Power ◽  
Financial Benefits ◽  
Technological Developments ◽  
Additional Circuitry

This study reviews the hardware approach to mitigate the effects of module mismatch in a grid-connected photovoltaic (PV) system. Unlike software solutions, i.e. the maximum power tracking algorithm, hardware techniques are well suited to enhance energy yield because of their inherent ability to extract energy from the mismatched module. Despite the extra cost of the additional circuitry, hardware techniques have recently gained popularity because of their long-term financial benefits. Notwithstanding the growing interest in this topic, review papers that provide updates on the technological developments of the three main hardware solutions, namely micro inverter, DC power optimizer, and energy recovery circuits, are lacking. This is in contrast to software solutions, which have had a considerable number of reputable reviews. Thus, a comprehensive review paper is appropriate at this juncture to provide up-to-date information on the latest topologies, highlight their merits/drawbacks, and evaluate their comparative performance.

Harnessing Solar Energy Through Photovoltaic System in Chandigarh: A Step Towards Preparing for Climate Change

2019 ◽  
Vol 65 (2) ◽  
pp. 325-345
Author(s):  
Purva Mishra
Keyword(s):  
Climate Change ◽  
Solar Energy ◽  
Ghg Emissions ◽  
Photovoltaic System ◽  
Primary Data ◽  
Solar Pv ◽  
Pv System ◽  
Decisive Action ◽  
The Impact

Climate is rapidly changing with disruptive impacts. Without decisive action, energy-related greenhouse gas (GHG) emissions would lead to climate degradation. All types of energy efficiency technologies will require widespread deployment, as global warming is likely to reach 1.5°C between 2030 and 2052, if it continues to increase at the current rate. Photovoltaic (PV) energy is one of the most promising emerging technologies in mitigating the impact of climate change. PV is the name of a method of converting solar energy into direct current electricity. Therefore, the objectives of this article are to study the initiatives taken by energy development agencies in India for promoting renewable sources of energy, to study the use of solar power as a renewable source of energy through PV system and to analyse the solar PV rooftop system in Chandigarh as a case study. The article is an empirical study based on primary data. For the purpose of collecting the primary data, a structured questionnaire was prepared for citizens and an interview schedule for officials. The results of the study show that the majority of the citizens were satisfied with the solar photovoltaic (SPV) installations in Chandigarh, while a very few of them were dissatisfied and their dissatisfaction revolved around getting clearances from different departments.

scholarly journals Sizing verification of a 4kWp retrofitted grid-connected photovoltaic system: a case study in Shah Alam, Malaysia

2020 ◽  
Vol 17 (2) ◽  
pp. 654
Author(s):  
F.A.M. Shukor ◽  
H. Zainuddin ◽  
A. Manja ◽  
F. L. M. Khir
Keyword(s):  
Renewable Energy ◽  
Nuclear Energy ◽  
Best Practice ◽  
Photovoltaic System ◽  
Pv System ◽  
Simulation Tools ◽  
Array Configuration ◽  
System A ◽  
Mathematical Design

Electricity are commonly generated from several types of energy resources such as fossil and nuclear energy. However, due to emission of carbon dioxide from both sources, renewable energy is introduced to provide a clean and secure sustainable energy. One of the potential renewable energy application is Photovoltaic (PV) system; namely grid-connected photovoltaic (GCPV) system and stand-alone photovoltaic (SAPV) system. In this study, a mathematical approach of SEDA’s GCPV sizing model is implemented to size a 4kWp of a retrofitted GCPV system by the method claimed to be the best practice mathematical design model under tropical climate Malaysia.  The outcome of the sizing approach will then be evaluated with HelioScope software, one of commercial simulation tools available in current market.  The final result obtained from both methods shows that the final PV array configuration is 1 x 12 (parallel x series) which is in agreement to the actual installed system.

scholarly journals Sizing a 3 kWp Retrofitted Grid-Connected Photovoltaic System: a Case Study in Tropical Malaysia

2019 ◽  
Vol 7 (4.14) ◽  
pp. 466
Author(s):  
Hedzlin Zainuddin ◽  
Farah Liyana Muhammad Khir ◽  
NA Baharudin ◽  
ZAbd Rahman
Keyword(s):  
Customer Satisfaction ◽  
Photovoltaic System ◽  
Energy Yield ◽  
Mathematical Approach ◽  
Array Configuration ◽  
Pv Array ◽  
System A ◽  
Percentage Difference ◽  
And Performance

The work presents a tropical case study of sizing 3 kWp retrofitted  grid-connected photovoltaic system (GCPV) installed in Klang, Malaysia. The sizing was based on customer’s budget requirement of RM 22, 500 and conducted through a designated mathematical approach. The mathematical approach involved technical aspects which aligns the voltage and current specifications of both PV array and inverter. Besides, this approach includes possible severe climatic condition of solar irradiance and ambient temperature variations. By implementing the sizing mathematical approach in this study, the final PV array configuration is 1 x 9 (1 parallel x 9 series). This study was also conducted to compare between the actual and the predicted energy yield to reflect customer satisfaction. Based on the result, the percentage differences are acceptable for February and March 2018. Interestingly, the percentage difference for January 2018 was over-predicted and the abnormality was suggested to be resulted from the inaccuracy of the Peak Sun Hour (PSH) estimation. In conclusion, this study is significant as an overview on the sizing and performance reliability of GCPV system in tropical Malaysia to meet up the customer satisfaction. 

scholarly journals Experimental Study on the Effect of Dust Deposition on a Car Park Photovoltaic System with Different Cleaning Cycles

2021 ◽  
Vol 13 (14) ◽  
pp. 7636
Author(s):  
Khaled M. Alawasa ◽  
Rashid S. AlAbri ◽  
Amer S. Al-Hinai ◽  
Mohammed H. Albadi ◽  
Abdullah H. Al-Badi
Keyword(s):  
Negative Impact ◽  
Photovoltaic System ◽  
Energy Yield ◽  
Solar Pv ◽  
Dust Deposition ◽  
Pv System ◽  
Pv Systems ◽  
Car Park ◽  
The Impact ◽  
Dust Accumulation

For a decade, investments in solar photovoltaic (PV) systems have been increasing exponentially in the Middle East. Broadly speaking, these investments have been facing tremendous challenges due to the harsh weather in this particular part of the world. Dust accumulation is one the challenges that negatively affects the performance of solar PV systems. The overall goal of this paper is to thoroughly investigate the effect of dust accumulation on the energy yield of car park PV systems. With this aim in mind, the paper presents scientific values for further research and opens the horizon for attracting further investments in solar PV systems. This study is based on a real PV system in the Sultanate of Oman and considers different cleaning cycles for 16 months (from 29 July 2018 to 10 November 2019). Furthermore, four different PV groups were assessed, and the system was monitored under different cleaning frequencies. In general, it was found that dust accumulation has a significant impact; under 29-day, 32-day, 72-day, and 98-day cleaning cycles, the average percentages of energy loss due to soiling were 9.5%, 18.2%, 31.13%, and 45.6%, respectively. In addition, the dust effect has a seasonal variation. The study revealed that dust accumulation has a more negative impact during summer than during winter. During summer, the energy losses due to soiling were 8.7% higher than those during winter. The difference was attributed to different environmental conditions, with high humidity and low wind speed being the main factors that worsen the impact of dust during summer. Based on the findings of this research, a monthly cleaning program is highly recommended in the city of Muscat.

Technology and Hospital Information System: A Case of Implementation of Electronic Clinical Records in Hospital Maternity Irene Neto in Lubango, Angola

2019 ◽  
Vol 10 (11) ◽  
pp. 1131-1135
Author(s):  
Tomas Hambili Paulo Sanjuluca ◽  
◽  
Ricardo Correia ◽  
Anabela Antunes de Almeida ◽  
Ana Gloria Diaz Martinez ◽  
...  
Keyword(s):  
Maternity Hospital ◽  
Management Support ◽  
Retrospective Case ◽  
System A ◽  
Clinical Records ◽  
Retrospective Case Study ◽  
The Impact ◽  
And Child Health

Introduction: In order to have a good assessment of the quality of maternal and child health care, it is essential that there is up-to-date and reliable information. Objective: To evaluate the impact of the implementation of a computerized database of clinical processes in the admission, archive and medical statistics section, of Maternity hospital Irene Neto/Lubango-Angola. Methodology: A descriptive study with a quantitative and qualitative approach to carry out a retrospective case study deliveries and newborns, records from 2014 to 2017. Final considerations: The implementation of this project may contribute to the improvement of clinical management support management of the hospital as well as facilitating access to information for research and scientific production.

The Impact of Political Transition on Ghana’s Educational System. A Case Study of the 4th Republic

2018 ◽  
Author(s):  
Emmanuel Owusu-Kwarteng ◽  
Prince Opoku ◽  
Gershon Dagba ◽  
Mark Amankwa
Keyword(s):  
Educational System ◽  
Political Transition ◽  
System A ◽  
The Impact

scholarly journals Influence of Artificial and Natural Cooling on Performance Parameters of a Solar PV System: A Case Study

IEEE Access ◽  
2021 ◽  
Vol 9 ◽  
pp. 29449-29457
Author(s):  
Subhash Chandra ◽  
Arvind Yadav ◽  
Mohd Abdul Rahim Khan ◽  
Mukesh Pushkarna ◽  
Mohit Bajaj ◽  
...  
Keyword(s):  
Performance Parameters ◽  
Solar Pv ◽  
Pv System ◽  
System A ◽  
Solar Pv System
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